#include <stdio.h>
int main()
{
    int ret =0;
    int a = 1;
    int b = 0;
    int c = 0;
    scanf("%d",&ret);
        while(a<ret){
          b = ret % a;
           printf("b is %d\n",b);
          if(b==0){
              c++;
            printf("c is %d\n",c);
          }
            a++;
         printf("a is %d\n",a);
    } 
    if(c==1){
    	     printf("%d is sushu\n",ret);
	}else{
		  printf("%d not is sushu\n",ret);
	}
return 0;
}

